Unless it was massive chunks coming off the chiller, I doubt that it was enough oxidized copper to really harm you. I did the same thing once running the wort through the chiller after letting it sit with StarSan for too long, the wort had a distinct green color for a little while when it came out, thought it was hops, then discovered on here that StarSan does a wicked pitting job on copper if left for an amount of time. Bottled it anyway and didn't taste anything off about it.